Display panel and manufacturing method thereof, and display device

ABSTRACT

Disclosed are a display panel, a manufacturing method thereof and a display device. The display panel includes a substrate, multiple organic light emitting elements, and a film encapsulation layer. The film encapsulation layer covers more than one of the multiple organic light emitting elements, the film encapsulation layer includes a lens layer and a first cover layer, the lens layer is located on a side of the first cover layer facing the organic light emitting elements, materials of the lens layer and the first cover layer are both organic materials, a refractive index of the lens layer is M, a refractive index of the first cover layer is N, N&lt;M, the lens layer includes multiple lenses, and a surface of each of the multiple lenses facing away from the organic light emitting elements is convex towards a side facing away from the multiple organic light emitting elements.

CROSS-REFERENCE TO RELATED APPLICATIONS

This application claims priority to Chinese patent application No.CN202010373350.8 filed with CNIPA on May 6, 2020, the disclosure ofwhich is incorporated herein by reference in its entirety.

FIELD

The present disclosure relates to the field of display technologies and,in particular, to a display panel, a manufacturing method thereof and adisplay device.

BACKGROUND

Organic light emitting display panels have the advantages ofself-lighting without backlight, high brightness, and low powerconsumption, and are widely used in various electronic devices.

At present, the theoretical internal quantum efficiency of an organiclight emitting display panel is close to 100%; however, since filmlayers made of different materials in the organic light emitting displaypanel have different refractive indexes, light emitted by an organiclight emitting element is reflected or totally reflected at an interfacebetween adjacent film layers made of different materials, so that thelight extraction efficiency of the display panel is not high.

SUMMARY

The present disclosure provides a display panel, a manufacturing methodthereof and a display device, to increase the light extractionefficiency of the display panel.

One embodiment of the present disclosure provides a display panel. Thedisplay panel includes: a substrate; multiple organic light emittingelements, which are located on one side of the substrate; and a filmencapsulation layer, which is located on a side of the multiple organiclight emitting elements facing away from the substrate; where the filmencapsulation layer covers more than one of the multiple organic lightemitting elements, the film encapsulation layer includes a lens layerand a first cover layer, the lens layer is located on a side of thefirst cover layer facing the organic light emitting elements, materialsof the lens layer and the first cover layer are both organic materials,a refractive index of the lens layer is M, a refractive index of thefirst cover layer is N, N<M, the lens layer includes multiple lenses,and a surface of each of the multiple lenses facing away from theorganic light emitting elements is convex towards a side facing awayfrom the multiple organic light emitting elements.

One embodiment of the present disclosure further provides a displaydevice including the display panel described in the above embodiment.

One embodiment of the present disclosure further provides a method ofmanufacturing a display panel, where the method is used to manufacturethe display panel described in the above first embodiments, and themethod for manufacturing the display panel includes: providing asubstrate; forming multiple organic light emitting elements on thesubstrate; and forming a film encapsulation layer on a side of themultiple organic light emitting elements facing away from the substrate.

The step of forming the film encapsulation layer includes: forming alens layer on a side of the multiple organic light emitting elementsfacing away from the substrate, where the lens layer includes multiplelenses; and forming a first cover layer on a side of the lens layerfacing away from the multiple organic light emitting elements.

Materials of the lens layer and the first cover layer are both organicmaterials, a refractive index of the lens layer is M, a refractive indexof the first cover layer is N, N<M, and a surface of each of themultiple lenses facing away from the organic light emitting elements isconvex towards a side facing away from the multiple organic lightemitting elements.

BRIEF DESCRIPTION OF DRAWINGS

Embodiments of the present disclosure will become more apparent byreading the detailed description with reference to the followingdrawings.

FIG. 1 is a schematic structural diagram of a display panel according toan embodiment of the present disclosure;

FIG. 2 is a schematic structural diagram of another display panelaccording to an embodiment of the present disclosure;

FIG. 3 is a schematic structural diagram of another display panelaccording to an embodiment of the present disclosure;

FIG. 4 is a schematic structural diagram of another display panelaccording to an embodiment of the present disclosure;

FIG. 5 is a schematic structural diagram of another display panelaccording to an embodiment of the present disclosure;

FIG. 6 is a schematic structural diagram of another display panelaccording to an embodiment of the present disclosure;

FIG. 7 is a schematic structural diagram of another display panelaccording to an embodiment of the present disclosure;

FIG. 8 is a schematic structural diagram of another display panelaccording to an embodiment of the present disclosure;

FIG. 9 is a schematic structural diagram of another display panelaccording to an embodiment of the present disclosure;

FIG. 10 is a schematic structural diagram of another display panelaccording to an embodiment of the present disclosure;

FIG. 11 is a schematic structural diagram of another display panelaccording to an embodiment of the present disclosure;

FIG. 12 is a schematic structural diagram of another display panelaccording to an embodiment of the present disclosure;

FIG. 13 is a schematic structural diagram of another display panelaccording to an embodiment of the present disclosure;

FIG. 14 is a schematic structural diagram of another display panelaccording to an embodiment of the present disclosure;

FIG. 15 is a schematic structure diagram of a display device accordingto an embodiment of the present disclosure;

FIG. 16 is a schematic flowchart of a method of manufacturing a displaypanel according to an embodiment of the present disclosure;

FIG. 17 is a schematic flowchart of a process of forming a filmencapsulation layer according to an embodiment of the presentdisclosure;

FIG. 18 is a schematic flowchart of a method of manufacturing anotherdisplay panel according to an embodiment of the present disclosure;

FIGS. 19 to 22 are schematic diagrams of a manufacturing process of adisplay panel according to an embodiment of the present disclosure;

FIG. 23 is a schematic flowchart of a method of manufacturing anotherdisplay panel according to an embodiment of the present disclosure;

FIG. 24 is a schematic structure diagram of a second cover layer formedon a lens layer according to an embodiment of the present disclosure;

FIG. 25 is a schematic flowchart of a method of manufacturing anotherdisplay panel according to an embodiment of the present disclosure; and

FIGS. 26 to 29 are schematic diagrams of a manufacturing process of adisplay panel according to an embodiment of the present disclosure.

DETAILED DESCRIPTION

Embodiments of a display panel, a manufacturing method thereof and adisplay device according to the present disclosure are described indetail below with reference to the drawings and embodiments.

One embodiment of the present disclosure provides a display panel. Thedisplay panel includes: a substrate; multiple organic light emittingelements, which are located on one side of the substrate; and a filmencapsulation layer, which is located on a side of the multiple organiclight emitting elements facing away from the substrate; where the filmencapsulation layer covers more than one of the multiple organic lightemitting elements, the film encapsulation layer includes a lens layerand a first cover layer, the lens layer is located on a side of thefirst cover layer facing the organic light emitting elements, materialsof the lens layer and the first cover layer are both organic materials,a refractive index of the lens layer is M, a refractive index of thefirst cover layer is N, N<M, the lens layer includes multiple lenses,and a surface of each of the lenses facing away from the organic lightemitting elements is convex towards a side facing away from the multipleorganic light emitting elements.

According to the present disclosure, the film encapsulation layerincludes a lens layer and a first cover layer, the first cover layer islocated on a side of the lens layer facing away from the organic lightemitting elements, the materials of the lens layer and the first coverlayer are both organic materials, the refractive index of the lens layeris less than the refractive index of the first cover layer, the lenslayer includes multiple lenses, the surface of each lens facing awayfrom an organic light emitting element is convex toward the side facingaway from the organic light emitting element, so that the propagationdirection of the light emitted by the organic light emitting element ischanged under the influence of the lens and the first covering layer, sothat the amount of the reflected or totally reflected light is reduced,and the light extraction efficiency of the display panel is increased.

Secondly, the present disclosure is described in detail with referenceto the schematic diagrams. In the detailed description of theembodiments of the present disclosure, for the convenience ofexplanation, the schematic diagrams showing the structure of the deviceare not partially enlarged according to general proportions, and theschematic diagrams are merely examples, which should not limit the scopeof protection of the present disclosure. In addition, the actualproduction should include three-dimensional space dimensions of length,width and height.

In order to increase the light extraction efficiency of the organiclight emitting display panel, in the related art, a light path adjustinglayer for changing the light propagation direction is located in theorganic light emitting display panel to reduce the amount of lightreflected and totally reflected in the organic light emitting displaypanel. The light path adjusting layer is not an inherent structure ofthe organic light emitting display panel, and is additionally added tothe organic light emitting display panel, which may result in anincrease in the thickness of the organic light emitting display panel,contrary to the requirement of thinning the existing display panel.

In view of the above, the embodiment of the present disclosure providesa lens layer and a first cover layer for changing the light path in thefilm encapsulation layer of the display panel. The materials of the lenslayer and the first cover layer are both organic materials, so that thelens layer and the first cover layer can replace an original organiclayer in the film encapsulation layer, and the light extractionefficiency of the display panel is increased without changing thethickness of the display panel.

FIG. 1 is a schematic structural diagram of a display panel according toan embodiment of the present disclosure. As shown in FIG. 1, the displaypanel includes a substrate 100, multiple organic light emitting elements200 and a film encapsulation layer 300.

The multiple organic light emitting elements 200 are located on one sideof the substrate 100. The film encapsulation layer 300 is located on oneside of the organic light emitting element 200 facing away from thesubstrate 100, the film encapsulation layer 300 covers more than oneorganic light emitting element 200, the film encapsulation layer 300includes a lens layer 310 and a first cover layer 320, the lens layer310 is located on one side of the first cover layer 320 facing theorganic light emitting elements 200, materials of the lens layer 310 andthe first cover layer 320 are organic materials, a refractive index ofthe lens layer 310 is M, a refractive index of the first cover layer 320is N, N<M, the lens layer 310 includes multiple lenses 311, and asurface of the lens 311 facing away from the organic light emittingelement 200 is convex toward a side facing away from the organic lightemitting element 200.

FIG. 1 only uses an example in which each organic light emitting element200 corresponds to one lens 311 as an example for description and notlimitation. In other implementation manners of the embodiment, eachorganic light emitting element 200 may correspond to multiple lenses311.

Exemplarily, materials of the lens layer 310 and the first cover layer320 may be organic glass.

It should be noted that the lens layer 310 and the first cover layer 320are used to adjust the propagation direction of the light emitted fromthe organic light emitting element 200, the amount of light thatundergoes total reflection is reduced and the light extractionefficiency of the display panel is improved.

It should also be noted that the conventional film encapsulation layer300 is a laminated structure of an inorganic layer, an organic layer andan inorganic layer. In the embodiment, the lens layer 310 and the firstcover layer 320 are both formed by using an organic material, and canjointly replace one organic layer in the film encapsulation layer 300;

the light extraction efficiency of the display panel can be increased byarranging the lens layer 310 and the first cover layer 320 while thethickness of the film encapsulation layer 300 is not changed.

It is noted that when the surface of the lens 311 facing away from theorganic light emitting element 200 is convex toward the side facing awayfrom the organic light emitting element 200, the lens layer 320 may beformed by using an inkjet printing technique or a photolithographytechnique, so that the lens layer 320 may be formed by flexiblyselecting a more suitable process according to actual needs.

With continued reference to FIG. 1, the organic light emitting element200 includes a first electrode 210, an organic light emitting functionlayer 220 and a second electrode 230 which are stacked along the lightextraction direction of the organic light emitting element 200, thesubstrate 100 includes multiple pixel driving circuits, each pixeldriving circuit is electrically connected to one first electrode 210correspondingly, the pixel driving circuit is used for driving thecorresponding organic light emitting element 200 to emit light, theconventional pixel driving circuit includes multiple film transistorsand at least one capacitor, and the position of the corresponding pixeldriving circuit is illustrated by one film transistor 700 in the pixeldriving circuit in FIG. 1. To simplify the structure of the drawings,the internal structures of the substrate 100 and the organic lightemitting element 200 are not illustrated in detail in the followingdrawings.

FIG. 2 is a schematic structural diagram of another display panelaccording to an embodiment of the present disclosure. As shown in FIG.2, on the basis of the structure shown in FIG. 1, the film encapsulationlayer 300 further includes a first inorganic layer 330, and the firstinorganic layer 330 is located between the organic light emittingelement 200 and the lens layer 310.

It should be noted that, due to the characteristics of the material, thewater-oxygen blocking ability of the inorganic layer is superior to thatof the organic layer. The first inorganic layer 330 provided between theorganic light emitting element 200 and the lens layer 310 can enhancethe water-oxygen blocking ability of the film encapsulation layer 300,and thus enhance the encapsulation effect of the film encapsulationlayer 300.

Exemplarily, the material of the first inorganic layer 330 may besilicon nitride, silicon oxide, silicon oxynitride, or silicon carbide.In an embodiment, the material of the first inorganic layer 330 may alsobe aluminum oxide. The aluminum oxide formed by an atomic layerdeposition process has a strong water-oxygen blocking ability and asmall thickness, and can obtain an effective water-oxygen blockingeffect with a small thickness. On one hand, when the lens layer 310 onthe first inorganic layer 330 is formed by an inkjet printing process,the water vapor in the printing droplets can be blocked from invadinginto the organic light emitting element, avoiding damage to the organiclight emitting element. On the other hand, the first inorganic layer 330is a film layer located between the organic light emitting element 200and the lens layer 310, and its smaller thickness can reduce thedistance between the lens 311 and the corresponding organic lightemitting element 200, so that the propagation direction of more light isadjusted by the lens 311, which is beneficial to the increase of thelight extraction efficiency of the display panel.

Further, FIG. 3 is a schematic structural diagram of another displaypanel according to an embodiment of the present disclosure. As shown inFIG. 3, on the basis of the structure shown in FIG. 2, the filmencapsulation layer 300 further includes a second cover layer 350, thesecond cover layer 350 is located between the lens layer 310 and thefirst cover layer 320, and the material of the second cover layer 350 isan inorganic material. The second cover layer 350 includes a firstportion overlapping the lens 311 and a second portion not overlappingthe lens 311. The second portion of the second cover layer 350 is incontact with the first inorganic layer 330.

It should be noted that the lens 311 is formed of an organic material.Compared with the first inorganic layer 330 and the second cover layer350 formed of an inorganic material, the water-oxygen blocking abilityof the lens 311 is poor. In the embodiment, the second cover layer 350and the first inorganic layer 330 tightly cover the lenses 311, whichimproves the water-oxygen blocking ability of the film encapsulationlayer 300.

Exemplarily, the material of the second cover layer 350 may be siliconnitride, silicon oxide, silicon oxynitride, or silicon carbide.

In an embodiment, the refractive index of the second cover layer 350 isP, where N<P<M.

It should be noted that the refractive index increases in turn for thelens 311, the second cover layer 350, and the first cover layer 320which are successively laminated, the light at the interface between anytwo adjacent film layers has a same deflection directions, thecontinuity is good, and the light will not be totally reflected from thelight sparse material to the light dense material, so that the lightloss inside the film encapsulation layer 300 is avoided.

Exemplarily, 1.4≤P≤1.9, 1.0≤N SN1.6, and 1.5≤M≤2.0. Solid materials havethe refractive index greater than 1.0, a material with a refractiveindex greater than 1.9 is difficult to manufacture, the refractive indexof the lens layer 310 is less than that of the first cover layer 320,and the refractive index ranges of the two do not overlap. Therefore,1.0 to 1.9 is divided into two intervals, which respectively correspondto the refractive index range of the lens layer 310 and the refractiveindex range of the first cover layer 320.

FIG. 4 is a schematic structural diagram of another display panelaccording to an embodiment of the present disclosure. As shown in FIG.4, based on the structure shown in FIG. 1, the film encapsulation layer300 further includes a second inorganic layer 340. The second inorganiclayer 340 is located on one side of the first cover layer 320 facingaway from the organic light emitting element 300.

It should be noted that the film encapsulation layer 300 with the secondinorganic layer 340 has better water-oxygen blocking ability and betterencapsulation effect for the organic light emitting element 200.

In an embodiment, the material of the second cover layer 350 may besilicon nitride, silicon oxide, silicon oxynitride, or silicon carbide.

FIG. 5 is a schematic structural diagram of another display panelaccording to an embodiment of the present disclosure. As shown in FIG.5, based on the structure shown in FIG. 4, the display panel furtherincludes a touch function layer 400. The touch function layer 400 islocated on a side of the second inorganic layer 340 facing away from thesubstrate 100.

It should be noted that the film encapsulation layer 300 is providedwith multiple signal lines on a side close to the substrate 100. If athickness of the film encapsulation layer 300 is too small, theelectrical signal on each signal line will interfere with the touchfunction layer 400, resulting in poor touch performance of the touchfunction layer 400. It enables to adjust the thickness of the filmencapsulation layer 300 by reasonably setting the thickness of the lenslayer 310 and the first cover layer 320, to avoid the distance betweenthe touch function layer 400 and each signal line being reduced, andavoid the deterioration of the touch performance of the touch functionlayer 400.

It should also be noted that the second inorganic layer 340 is formedbefore the touch function layer 400. When the film deposition process isused to form the touch function layer 400, the second inorganic layer340 may be used as a substrate of the touch function layer 400.

FIG. 6 is a schematic structural diagram of another display panelaccording to an embodiment of the present disclosure. As shown in FIG.6, based on the structure shown in FIG. 2, the display panel furtherincludes a touch function layer 400. The touch function layer 400 islocated on a side of the first cover layer 320 facing away from thesubstrate, and is in contact with the first cover layer 320.

It should be noted that the touch function layer 400 is formed of aninorganic material, which has a certain water-oxygen blocking effect,and can block invasion of the water vapor on a side facing away from thefilm encapsulation layer 300. At this time, the film encapsulation layer300 no longer needs to be provided with an inorganic layer on the firstcover layer 310, which is conducive to simplifying the manufacturingprocess of the display panel.

FIG. 7 is a schematic structural diagram of another display panelaccording to an embodiment of the present disclosure. FIG. 8 is aschematic structural diagram of another display panel according to anembodiment of the present disclosure. Based on the structures shown inFIGS. 5 and 6, as shown in FIGS. 7 and 8, the display panel furtherincludes a color resistance layer 500. The color resistance layer 500 islocated on a side of the touch function layer 400 facing away from thesubstrate 100 and includes multiple color resistances 510.

Exemplarily, the light extraction side of each organic light emittingelement 200 is correspondingly provided with a color resistance 510, andthe color of the color resistance 510 may be red, green, or blue. It maybe understood that if a thickness of a film layer between the colorresistance layer 500 and the organic light emitting element 200 is toolarge, light interference between adjacent organic light emittingelements 200 may occur. In the embodiment, the film encapsulation layer300 is located between the color resistance layer 500 and the organiclight emitting element 200, and the thickness of the film encapsulationlayer 300 may be adjusted by reasonably setting the thickness of thelens layer 310 and the first cover layer 320, so that the thickness ofthe film between the color resistance layer 500 and the organic lightemitting element 200 is adjusted to avoid light crosstalk.

It should be noted that, in order to ensure that the touch functionlayer 400 has a better touch performance, the thickness of the filmencapsulation layer 300 needs to be increased, but in order to avoidlight interference, the thickness of the film encapsulation layer needsto be decreased, and the optimal setting scheme in comprehensiveconsideration of the above two factors is: the lens layer 310 and thefirst cover layer 320 are added to the display panel without changingthe thickness of the film encapsulation layer 300, to improve the lightextraction efficiency of the display panel. It enables to achieve theabove mentioned effects, and can take into account both the touchperformance of the touch function layer 400 and the display effect ofthe display panel.

In the embodiment, the film encapsulation layer 300 may include at leastone of the first inorganic layer 310 and the second inorganic layer 340,that is, the film encapsulation layer 300 only include the firstinorganic layer 310, only include the second inorganic layer 340, orinclude both the first inorganic layer 310 and the second inorganiclayer 340; and in the structure including the first inorganic layer 310,the second cover layer 350 may be included at the same time. The aboveFIGS. 1 to 8 only illustrate some of the structures, and otherstructures that are not illustrated are also within the scope of thepresent application, for example, FIG. 9 is a schematic structuraldiagram of another display panel provided by an embodiment of thepresent disclosure, and the film encapsulation layer 300 includes boththe first inorganic layer 310 and the second inorganic layer 320.Further, with reference to FIG. 9, the display panel may further includea cover plate 800, and the cover plate 800 is located on a side of thecolor resistance layer 500 facing away from the touch function layer400.

FIG. 10 is a schematic structural diagram of another display panelaccording to an embodiment of the present disclosure. As shown in FIG.10, the film encapsulation layer 300 further includes scatteringparticles 600, and the scattering particles 600 are located inside thelens 311.

FIG. 11 is a schematic structural diagram of another display panelaccording to an embodiment of the present disclosure. As shown in FIG.11, the film encapsulation layer 300 further includes scatteringparticles 600, and the scattering particles 600 are located on a surfaceof the lens 311 on a side facing away from the substrate 100.

FIG. 12 is a schematic structural diagram of another display panelaccording to an embodiment of the present disclosure. As shown in FIG.12, the film encapsulation layer 300 further includes scatteringparticles 600, some of the scattering particles 600 are located insidethe lens 311, and the remaining scattering particles 600 are located ona surface of the lens 311 on a side facing away from the substrate 100.

It should be noted that the scattering particles 600 are used to furtherchange the propagation direction of the incident light, to reduce theamount of reflected or totally reflected light, and improve the lightextraction effect of the display panel. In order to achieve the abovepurpose, a refractive index of the scattering particle 600 is differentfrom a refractive index of its surrounding structure, exemplarily, thesurrounding structure of the scattering particle 600 in FIG. 10 is thelens 311, and the scattering particle 600 has the refractive indexdifferent from that of the lens 311; the surrounding structure of thescattering particle 600 in FIG. 11 is the first cover layer 320, and thescattering particle 600 has the refractive index different from that ofthe first cover layer 320; the surrounding structure of the scatteringparticle 600 in FIG. 12 includes the lens 311 and the first cover layer320, and the scattering particle 600 has the refractive index differentfrom that of the lens 311 and the first cover layer 320.

In an embodiment, the material of the scattering particles 600 may besilica nanoparticles or organic glass. Exemplarily, the value range ofthe diameter of the scattering particles 600 may be greater than orequal to 5 nm and less than or equal to 100 nm. This range is only anexample and is not limiting, and an operator may make reasonablesettings according to actual needs.

In other implementations of the embodiment, for the film encapsulationlayer 300 with the second cover layer, part or all of the scatteringparticles 600 may be located on a surface of the second cover layerfacing the first cover layer 320.

With continued reference to FIGS. 10, 11 and 12, the lens 311 includes acentral area A and an edge area B located around the central area A. Theconcentration of the scattering particles 600 in the central area A isJ1, and the concentration of the scattering particles 600 in the edgearea B is J2, and J1<J2.

It should be noted that the incident angle of the light emitted by theorganic light emitting element 200 in the central region A is close to0, and total reflection hardly occurs, while the probability of totalreflection of the light incident in the edge region B is high, and theamount of light subjected to the total reflection may be effectivelyreduced by changing the transmission path of the light through thescattering particles 600, so that the concentration of the scatteringparticles 600 in the central region A is set to be lower than that ofthe scattering particles 600 in the edge region B.

FIG. 13 is a schematic structural diagram of another display panelaccording to an embodiment of the present disclosure. As shown in FIG.13, the film encapsulation layer 300 further includes scatteringparticles 600, and the scattering particles 600 are located inside thefirst cover layer 320.

It should be noted that the scattering particles 600 located in thefirst cover layer 320 can also change the propagation direction of theincident light and increase the light extraction efficiency of thedisplay panel.

FIG. 14 is a schematic structural diagram of another display panelaccording to an embodiment of the present disclosure. As shown in FIG.14, multiple organic light emitting elements 200 includes multiple redorganic light emitting elements 201, multiple green organic lightemitting elements 202, and multiple blue organic light emitting elements203. The lens 311 corresponding to the red organic light emittingelement 201 is a first lens 301, the lens corresponding to the greenorganic light emitting element 202 is a second lens 302, the lenscorresponding to the blue organic light emitting element 203 is a thirdlens 303, the thickness of the first lens 301 is H1, the thickness ofthe second lens 302 is H2, the thickness of the third lens 303 is H3,H1>H3, and H2>H3.

It should be noted that the wavelength of blue light is small, and itstransmittance is low. In order to make the transmittance of the bluelight similar to that of the red light and green light to avoid thecolor cast, the thickness of the third lens 303 corresponding to theblue organic light emitting element 203 emitting blue light is setsmaller than the thickness of the first lens 301 and the second lens302.

FIG. 15 is a schematic structure diagram of a display device accordingto an embodiment of the present disclosure. As shown in FIG. 15, adisplay device 2 includes a display panel 1 provided by any embodimentof the present disclosure. Since the display device 2 provided in theembodiment includes any display panel 1 provided in the embodiment ofthe present disclosure, the display device 2 has the same orcorresponding beneficial effects as the display panel 1 included in it,which will not be repeated here.

FIG. 16 is a schematic flowchart of a method of manufacturing a displaypanel according to an embodiment of the present disclosure. Themanufacturing method of the display panel is used to manufacture thedisplay panel according to any embodiment of the present disclosure. Asshown in FIG. 16, the manufacturing method of the display panel includesthe following steps.

In step 11, a substrate is provided.

In step 12, multiple organic light emitting elements are formed on thesubstrate.

In step 13, a film encapsulation layer is formed on a side of theorganic light emitting element facing away from the substrate.

In one embodiment, FIG. 17 is a schematic flowchart of a process offorming a film encapsulation layer according to an embodiment of thepresent disclosure. As shown in FIG. 17, the method of forming the filmencapsulation layer includes the following steps.

In step 21, a lens layer is formed on a side of the multiple organiclight emitting elements facing away from the substrate, where the lenslayer includes multiple lenses.

In step 22, a first cover layer is formed on a side of the lens layerfacing away from the multiple organic light emitting elements; wherematerials of the lens layer and the first cover layer are both organicmaterials, a refractive index of the lens layer is M, a refractive indexof the first cover layer is N, N<M, and a surface of the lens facingaway from the organic light emitting elements is convex towards a sidefacing away from the organic light emitting element.

According to the embodiment, the film encapsulation layer includes alens layer and a first cover layer, the first cover layer is located ona side of the lens layer facing away from the organic light emittingelements, the materials of the lens layer and the first cover layer areboth organic materials, the refractive index of the lens layer is lessthan the refractive index of the first cover layer, the lens layerincludes multiple lenses, the surface of the lens facing away from theorganic light emitting element is convex toward the side facing awayfrom the organic light emitting element, so that the propagationdirection of the light emitted by the organic light emitting element ischanged under the influence of the lens and the first cover layer, sothat the amount of the reflected or totally reflected light is reduced,and the light extraction efficiency of the display panel is increased.

Exemplarily, the step of forming the lens layer may include: forming thelens layer by using an inkjet printing process or a photolithographyprocess.

It should be noted that the formation process of the lens layer in theembodiment is not limited to a single one, and the lens layer may beprepared by using a convenient and fast inkjet printing process or ahigh-accuracy photolithography process, and the manufacturing processmay be selected according to actual needs to improve the applicabilityof the lens layer in the corresponding scene.

In an embodiment, the step of forming the film encapsulation layer mayfurther include: before forming the lens layer, forming a firstinorganic layer by using a chemical vapor deposition process or anatomic layer deposition process, where the first inorganic layer coversmultiple organic light emitting elements. In one embodiment, FIG. 18 isa schematic flowchart of a method of manufacturing another display panelaccording to an embodiment of the present disclosure. As shown in FIG.18, the manufacturing method of the display panel includes the followingsteps.

In step 31, a substrate is provided.

With reference to FIG. 19, a substrate 100 is provided.

In step 32, multiple organic light emitting elements are formed on thesubstrate.

With reference to FIG. 20, multiple organic light emitting elements 200are formed on the substrate 100.

In step 33, a first inorganic layer is formed by using a chemical vapordeposition process or an atomic layer deposition process, where thefirst inorganic layer covers multiple organic light emitting elements.

With reference to FIG. 21, a first inorganic layer 330 is formed byusing a chemical vapor deposition process or an atomic layer depositionprocess, where the first inorganic layer 330 covers multiple organiclight emitting elements 200.

It should be noted that the atomic layer deposition process may platethe material on the substrate surface layer by layer in the form of amonoatomic film. The thickness of the first inorganic layer formed bythe atomic layer deposition process is more uniform and the structure isdenser, and the water-oxygen blocking ability is better, which isconducive to the improvement of the encapsulation effect of the filmencapsulation layer. In addition, an atomic layer deposition process maybe used to form a first inorganic layer with a small thickness but gooddensity, and the distance between the organic light emitting element andthe corresponding lens is reduced, and the light extraction efficiencyof the display panel is further increased.

On the other hand, the speed of manufacturing the first inorganic layerby the chemical vapor deposition process is fast, and the formed firstinorganic layer has good water-oxygen blocking ability.

In step 34, a lens layer is formed on a side of the multiple organiclight emitting elements facing away from the substrate, where the lenslayer includes multiple lenses.

With reference to FIG. 22, a lens layer 310 is formed on a side of themultiple organic light emitting elements 200 facing away from thesubstrate, where the lens layer 310 includes multiple lenses 311.

In step 35, a first cover layer is formed on a side of the lens layerfacing away from the multiple organic light emitting elements.

In one embodiment, FIG. 2 is referred.

In an embodiment, after forming the lens layer and before forming thefirst cover layer, the method may further include: forming a secondcover layer on a side of the lens layer facing away from the organiclight emitting element by using a chemical vapor deposition process oran atomic layer deposition process. The second cover layer and the firstinorganic layer jointly encapsulate the lens of the lens layer, wherethe material of the second cover layer is an inorganic material. In oneembodiment, FIG. 23 is a schematic flowchart of a method ofmanufacturing another display panel according to an embodiment of thepresent disclosure. As shown in FIG. 23, the manufacturing method of thedisplay panel includes the following steps.

In step 41, a substrate is provided.

In one embodiment, FIG. 19 is referred.

In step 42, multiple organic light emitting elements are formed on thesubstrate.

In one embodiment, FIG. 20 is referred.

In step 43, a first inorganic layer is formed by using a chemical vapordeposition process or an atomic layer deposition process, where thefirst inorganic layer covers multiple organic light emitting elements.

FIG. 21 is referred.

In step 44, a lens layer is formed on a side of the multiple organiclight emitting elements facing away from the substrate, where the lenslayer includes multiple lenses.

In one embodiment, FIG. 22 is referred.

In step 45, on a side of the lens layer facing away from the organiclight emitting element, a second cover layer is formed by using achemical vapor deposition process or an atomic layer deposition process,and the second cover layer and the first inorganic layer jointlyencapsulate the lenses of the lens layer.

With reference to FIG. 24, on a side of the lens layer 310 facing awayfrom the organic light emitting element 200, a second cover layer 350 isformed by using a chemical vapor deposition process or an atomic layerdeposition process, and the second cover layer 350 and the firstinorganic layer 330 jointly encapsulate the lens 311 of the lens layer310.

It should be noted that the atomic layer deposition process may be usedto form a second cover layer with a small thickness and goodwater-oxygen blocking ability, which is beneficial to furtherimprovement of the encapsulation effect of the film encapsulation layer.

In addition, the chemical vapor deposition process provides anothermanufacturing process of the second cover layer, which has a fastmanufacturing speed, and the formed second cover layer has a goodwater-oxygen blocking ability.

In step 46, a first cover layer is formed on a side of the lens layerfacing away from the multiple organic light emitting elements.

FIG. 3 is referred.

In an embodiment, the step of forming the film encapsulation layer mayfurther include: after forming the first cover layer, using a chemicalvapor deposition process to form a second inorganic layer on a side ofthe first cover layer facing away from the organic light emittingelement, where the second inorganic layer covers the first cover layer.After forming the film encapsulation layer, the step may furtherinclude: forming a touch function layer on a side of the filmencapsulation layer facing away from the organic light emitting element,where the touch function layer is in contact with the second inorganiclayer of the film encapsulation layer. In one embodiment, FIG. 25 is aschematic flowchart of a method of manufacturing another display panelaccording to an embodiment of the present disclosure. As shown in FIG.25, the manufacturing method of the display panel includes the followingsteps.

In step 51, a substrate is provided.

FIG. 19 is referred.

In step 52, multiple organic light emitting elements are formed on thesubstrate.

FIG. 20 is referred.

In step 53, a lens layer is formed on a side of the multiple organiclight emitting elements facing away from the substrate, where the lenslayer includes multiple lenses.

With reference to FIG. 26, a lens layer 310 is formed on a side of themultiple organic light emitting elements 200 facing away from thesubstrate 100, where the lens layer 310 includes multiple lenses 311.

In step 54, a first cover layer is formed on a side of the lens layerfacing away from the multiple organic light emitting elements.

With reference to FIG. 27, a first cover layer 320 is formed on a sideof the lens layer 310 facing away from the multiple organic lightemitting elements 200.

In step 55, a second inorganic layer is formed on a side of the firstcover layer facing away from the organic light emitting element by usinga chemical vapor deposition process, where the second inorganic layercovers the first cover layer.

With reference to FIG. 28, a second inorganic layer 340 is formed on aside of the first cover layer 320 facing away from the organic lightemitting element 200 by using a chemical vapor deposition process, wherethe second inorganic layer 340 covers the first cover layer 320.

In step 56, a touch function layer is formed on a side of the filmencapsulation layer facing away from the organic light emitting element,where the touch function layer is in contact with the second inorganiclayer of the film encapsulation layer.

With reference to FIG. 29, a touch function layer 400 is formed on aside of the film encapsulation layer 300 facing away from the organiclight emitting elements 200, where the touch function layer 400 is incontact with the second inorganic layer 340 of the film encapsulationlayer 300.

It should be noted that the embodiment only illustrates a method ofmanufacturing a display panel with a partial structure. All methods ofmanufacturing display panels with all structures provided in thisapplication are within the scope of protection of the embodiment.According to the structure of the display panel, on the basis of themethod for manufacturing the display panel shown in FIG. 16, themanufacturing steps of the corresponding structure may be added at thecorresponding timing positions, which will not be repeated here.

Exemplarily, the lens layer is formed by using an inkjet printingprocess in which the droplets used for printing contain scatteringparticles so that the inside of the formed lens contains scatteringparticles, and/or, after forming the lens layer, scattering particlesare formed on the surface of the lens layer facing away from thesubstrate.

In one embodiment, a lens containing scattering particles may be formedin the following manner: dispersing the scattering particles in theliquid printing material to form droplets containing the scatteringparticles; in the inkjet printing process, dropping a predeterminedamount of droplets at a preset position, which solidify and form thelens, where the lens formed at this time contains scattering particles.Further, droplets with two different scattering particle concentrationsmay be formed, and droplets with low concentration may be dropped at aposition corresponding to the center area of the lens, and droplets withhigh concentration may be dropped at a position corresponding to theedge area of the lens, and forming the lens with differentconcentrations of scattering particles in the center area and the edgearea.

In addition, the scattering particles may be formed on the surface ofthe lens layer facing away from the substrate in the following manner:configuring the dispersion solution of the scattering particles, wherethe liquid in the solution may make the scattering particles moreuniformly distributed, and easy to remove, coating or spraying thedispersion solution of the scattering particles on the surface of thelens layer facing away from the substrate side, then removing thesolution by heating or other means. Further, two kinds of dispersionsolutions with different scattering particle concentrations may beformed, and a dispersion solution with low concentration may be coatedon the surface of the corresponding lens center area, and a dispersionsolution with high concentration may be coated on the surface of thecorresponding lens edge area, to adjust the concentration of scatteringparticles on the surface of the center area and the edge area.

In an embodiment, the first cover layer is formed by an inkjet printingprocess. In the inkjet printing process, droplets used for printingcontain scattering particles, so that the inside of the formed firstcover layer contains scattering particles.

In one embodiment, the first cover layer containing scattering particlesmay be formed in the following manner: dispersing the scatteringparticles in the liquid printing material to form droplets containingthe scattering particles, in the inkjet printing process, dropping apredetermined amount of droplets at a preset position, and forming thefirst cover layer after curing.

In the embodiment, the lens layer is formed by using an inkjet printingprocess; in the inkjet printing process, droplets used for printingincludes a first volume droplet, a second volume droplet, and a thirdvolume droplet; a volume of the first volume droplet and a volume of thesecond volume droplet are both larger than a volume of the third volumedroplet, the first volume droplet is used to form a first lens, thesecond volume droplet is used to form a second lens, the third volumedroplet is used to form a third lens, a thickness of the first lens isH1, a thickness of the second lens is H2, and a thickness of the thirdlens is H3, where H1>H3, H2>H3. The organic light emitting elementincludes a red organic light emitting element, a green organic lightemitting element, and a blue organic light emitting element; the redorganic light emitting element overlaps the first lens, the greenorganic light emitting element overlaps the second lens, and the blueorganic light emitting element overlaps the third lens.

It should be noted that, when the volumes of the droplets used in theinkjet printing are different, the heights of the corresponding obtainedlenses are different, and when the volumes of the first volume ofdroplets and the second volume of droplets are both larger than thevolume of the third volume of droplets, the thickness of the blueorganic light emitting element formed by the third volume of droplets issmaller than the thickness of the red organic light emitting element andthe thickness of the green organic light emitting element.

In one embodiment, the lens layer is formed by using an inkjet printingprocess; in the inkjet printing process, the volumes of the liquid dropsused for printing are the same; and before the lens layer is formed, themethod further includes the following steps: the first inorganic layerincludes a first surface facing away from the organic light emittingelement, and the first surface is subjected to hydrophobizationtreatment or hydrophilization treatment, the treated first surfaceincludes a first portion, a second portion, and a third portion, and thehydrophobicity of the first portion and the hydrophobicity of the secondportion are both greater than the hydrophobicity of the third portion.The lens in contact with the first portion is a first lens, the lens incontact with the second portion is a second lens, and the lens incontact with the third portion is a third lens, a contact angle of thefirst lens and the first inorganic layer is α, a contact angle of thesecond lens and the first inorganic layer is β, and a contact angle ofthe third lens and the first inorganic layer is γ, where α>γ, β>γ. Theorganic light emitting element includes a red organic light emittingelement, a green organic light emitting element, and a blue organiclight emitting element; the red organic light emitting element overlapsthe first lens, the green organic light emitting element overlaps thesecond lens, and the blue organic light emitting element overlaps thethird lens.

It should be noted that the better the hydrophobicity of the firstsurface, the smaller the contact angle between the droplets for printingand the first surface, the better the droplets for printing can spreadout on the first surface, and thus the smaller the thickness. Based onthe above principle, before the lens is formed by adopting the inkjetprinting process, the surface of the first inorganic layer correspondingto the organic light emitting elements with different light emittingcolors is processed, so that the hydrophobicity of the surfacecorresponding to the blue organic light emitting element is greater thanthat of the surfaces corresponding to the other organic light emittingelements, and the thickness of the lens corresponding to the blueorganic light emitting element is reduced. In one embodiment, thesurface of the first inorganic layer may be hydrophilized orhydrophobized; and in an embodiment, the surface corresponding to theblue organic light emitting element is hydrophobized, and the surfacescorresponding to the red organic light emitting element and the greenorganic light emitting element are hydrophilized. Exemplarily, theplasma treatment method may be used for hydrophilization treatment orhydrophobization treatment.

What is claimed is:
 1. A display panel, comprising: a substrate; aplurality of organic light emitting elements, which are located on oneside of the substrate; a film encapsulation layer, which is located on aside of the plurality of organic light emitting elements facing awayfrom the substrate; wherein the film encapsulation layer covers theplurality of organic light emitting elements, the film encapsulationlayer comprises a lens layer and a first cover layer, the lens layer islocated on a side of the first cover layer facing the organic lightemitting elements, materials of the lens layer and the first cover layerare both organic materials, a refractive index of the lens layer is M, arefractive index of the first cover layer is N, N<M, the lens layercomprises a plurality of lenses, and a surface of each of the pluralityof lenses facing away from the organic light emitting elements is convextowards a side facing away from the plurality of organic light emittingelements.
 2. The display panel of claim 1, wherein the filmencapsulation layer further comprises a first inorganic layer, the firstinorganic layer is located between the plurality of organic lightemitting elements and the lens layer.
 3. The display panel of claim 2,wherein the film encapsulation layer further comprises a second coverlayer, the second cover layer is located between the lens layer and thefirst cover layer, and a material of the second cover layer is aninorganic material; and the second cover layer comprises a first portionoverlapping the plurality of lens and a second portion not overlappingthe plurality of lens, and the second portion of the second cover layeris in contact with the first inorganic layer.
 4. The display panel ofclaim 3, wherein the second cover layer has a refractive index of P,wherein N<P<M.
 5. The display panel of claim 1, wherein the filmencapsulation layer further comprises a second inorganic layer, thesecond inorganic layer is located on a side of the first cover layerfacing away from the plurality of organic light emitting elements. 6.The display panel of claim 5, further comprising: a touch functionlayer, wherein the touch function layer is located on a side of thesecond inorganic layer facing away from the substrate; and a colorresistance layer, wherein the color resistance layer is located on aside of the touch function layer facing away from the substrate andcomprises a plurality of color resistances.
 7. The display panel ofclaim 2, further comprising: a touch function layer, wherein the touchfunction layer is located on a side of the first cover layer facing awayfrom the substrate and in contact with the first cover layer; and acolor resistance layer, wherein the color resistance layer is located ona side of the touch function layer facing away from the substrate andcomprises a plurality of color resistances.
 8. The display panel ofclaim 1, wherein the film encapsulation layer further comprises aplurality of scattering particles, the plurality of scattering particlesis located inside each of the plurality of lenses, and/or the pluralityof scattering particles is located on a surface of a side of each of theplurality of lenses facing away from the substrate, wherein each of theplurality of lenses comprises a central region and an edge region aroundthe central region, concentration of the plurality of scatteringparticles in the central region is J1, and concentration of theplurality of scattering particles in the edge region is J2, whereinJ1<J2.
 9. The display panel of claim 1, wherein the film encapsulationlayer further comprises a plurality of scattering particles, and theplurality of scattering particles is located inside the first coverlayer.
 10. The display panel of claim 1, wherein the plurality oforganic light emitting elements comprises a red organic light emittingelement, a green organic light emitting element, and a blue organiclight emitting element; the plurality of lenses comprises a first lens,a second lens and a third lens, wherein the first lens overlaps the redorganic light emitting element, the second lens overlaps the greenorganic light emitting element, and the third lens overlaps the blueorganic light emitting element; a thickness of the first lens is H1, athickness of the second lens is H2, a thickness of the third lens is H3,wherein H1>H3, H2>H3.
 11. A display device, comprising a display panel,wherein the display panel comprises: a substrate; a plurality of organiclight emitting elements, which are located on one side of the substrate;a film encapsulation layer, which is located on a side of the pluralityof organic light emitting elements facing away from the substrate;wherein the film encapsulation layer covers the plurality of organiclight emitting elements, the film encapsulation layer comprises a lenslayer and a first cover layer, the lens layer is located on a side ofthe first cover layer facing the organic light emitting elements,materials of the lens layer and the first cover layer are both organicmaterials, a refractive index of the lens layer is M, a refractive indexof the first cover layer is N, N<M, the lens layer comprises a pluralityof lenses, and a surface of each of the plurality of lenses facing awayfrom the organic light emitting elements is convex towards a side facingaway from the plurality of organic light emitting elements.
 12. A methodof manufacturing the display panel according to claim 1, comprising:providing a substrate; forming a plurality of organic light emittingelements on the substrate; and forming a film encapsulation layer on aside of the plurality of organic light emitting elements facing awayfrom the substrate; wherein forming the film encapsulation layercomprises: forming a lens layer on a side of the plurality of organiclight emitting elements facing away from the substrate, wherein the lenslayer comprises a plurality of lenses; and forming a first cover layeron a side of the lens layer facing away from the plurality of organiclight emitting elements; wherein materials of the lens layer and thefirst cover layer are both organic materials, a refractive index of thelens layer is M, a refractive index of the first cover layer is N, N<M,and a surface of each of the plurality of lenses facing away from theorganic light emitting elements is convex towards a side facing awayfrom the plurality of organic light emitting elements.
 13. The method ofmanufacturing of claim 12, wherein forming the lens layer comprises:forming the lens layer by using an inkjet printing process or aphotolithography process.
 14. The method of manufacturing of claim 12,wherein forming the film encapsulation layer further comprises: forminga first inorganic layer by using a chemical vapor deposition process oran atomic layer deposition process before forming the lens layer,wherein the first inorganic layer covers the plurality of organic lightemitting elements.
 15. The method of manufacturing of claim 14, whereinafter forming the lens layer and before forming the first cover layer,the method further comprises: forming a second cover layer on a side ofthe lens layer facing away from the plurality of organic light emittingelements by using a chemical vapor deposition process or an atomic layerdeposition process, wherein the second cover layer and the firstinorganic layer jointly encapsulate the plurality of lenses of the lenslayer, wherein a material of the second cover layer is an inorganicmaterial.
 16. The method of manufacturing of claim 12, wherein formingthe film encapsulation layer further comprises: forming a secondinorganic layer on a side of the first cover layer facing away from theplurality of organic light emitting elements by using a chemical vapordeposition process after forming the first cover layer, wherein thesecond inorganic layer covers the first cover layer; wherein afterforming the film encapsulation layer, the method further comprises:forming a touch function layer on a side of the film encapsulation layerfacing away from the plurality of organic light emitting elements,wherein the touch function layer is in contact with the second inorganiclayer of the film encapsulation layer.
 17. The method of manufacturingof claim 12, wherein the lens layer is formed by using an inkjetprinting process, wherein droplets used for printing in the inkjetprinting process contain a plurality of scattering particles, to containthe plurality of scattering particles inside the plurality of formedlens; and/or after forming the lens layer, the plurality of scatteringparticles are formed on a surface of the lens layer on a side facingaway from the substrate.
 18. The method of manufacturing of claim 12,wherein the first cover layer is formed by using an inkjet printingprocess, wherein in the inkjet printing process, droplets used forprinting contain a plurality of scattering particle, to contain theplurality of scattering particles inside the first cover layer.
 19. Themethod of manufacturing of claim 12, wherein the lens layer is formed byusing an inkjet printing process, wherein in the inkjet printingprocess, droplets used for printing comprise a first volume droplet, asecond volume droplet, and a third volume droplet, a volume of the firstvolume droplet and a volume of the second volume droplet are both largerthan a volume of the third volume droplet, the first volume droplet isused to form a first lens, the second volume droplet is used to form asecond lens, the third volume droplet is used to form a third lens, athickness of the first lens is H1, a thickness of the second lens is H2,and a thickness of the third lens is H3, wherein H1>H3, H2>H3; theplurality of organic light emitting elements comprise a red organiclight emitting element, a green organic light emitting element, and ablue organic light emitting element, the red organic light emittingelement overlaps the first lens, the green organic light emittingelement overlaps the second lens, and the blue organic light emittingelement overlaps the third lens.
 20. The method of manufacturing ofclaim 14, wherein the lens layer is formed by using an inkjet printingprocess, wherein in the inkjet printing process, each droplet used forprinting has a same volume; wherein before forming the lens layer, themethod further comprises: the first inorganic layer comprises a firstsurface facing away from the plurality of organic light emittingelements, the first surface is subjected to a hydrophobization orhydrophilization treatment, the first surface after the hydrophobizationor hydrophilization treatment comprises a first portion, a secondportion and a third portion, and both the first portion and the secondportion have higher hydrophobicity than the third portion; wherein alens in contact with the first portion is a first lens, a lens incontact with the second portion is a second lens, and a lens in contactwith the third portion is a third lens, a contact angle of the firstlens and the first inorganic layer is α, a contact angle of the secondlens and the first inorganic layer is β, and α contact angle of thethird lens and the first inorganic layer is γ, wherein α>γ, β>γ; theplurality of organic light emitting elements comprise a red organiclight emitting element, a green organic light emitting element, and ablue organic light emitting element, the red organic light emittingelement overlaps the first lens, the green organic light emittingelement overlaps the second lens, and the blue organic light emittingelement overlaps the third lens.